BS EN 50341-2-15:2019 pdf free.Overhead electrical lines exceeding AC 1 kV.
The occurrence of vortex shedding on poles shall be considered, independent on the shape of the cross section, according the method defined in Annex E of
NEN-EN 1991-1-4+A1+C2:201 1/NB:2011. The effect of vortex shedding on the design life of the poles shall be determined. In case vortex shedding results in structural life less than the design life, measures against vortex shedding shall be taken to extend the structural life to at least the design life.
If for inspection and maintenance conductor bicycles or conductor vehicles are used the combination of the following load should be taken in account:
at the structural unfavourable position at the conductor 2 kN (conductor bicycles) or 3 kN (conductor vehicles); for inspection and maintenance a vertical load at the end of the cross-arm should be taken in account. The load depends on the number of worker present at the cross-arm end, but should not be less than 1 kN.In north Netherlands (region Groningen) supports shall be specified earthquake resistant in conformity with NPR 9998 and NEN-EN 1998-1.
In south Netherlands (region Roermond) supports shall be specified earthquake resistant in conformity with the requirements of NEN-EN 1998-1.
Floating ice or collisions.Loads caused by floating ice or collisions with ships shall be taken into account if supports are located in rivers, river foreland or lakes Determination of these loads shall be based on NEN-EN 1991-1-7.In addition for tension supports the standard load cases 1a, 3, 4 and 6a shall be considered taking in account the following specific circumstances (unless otherwise specified in the Project Specification): 一absence of all conductors in one span at one side of the tower; 一absence of all conductors in one span. The extreme wind force Qw5o on the conductor is given in clause 4.3.5. The peak wind pressure parameter 9n used in this clause is given in Table 4.3/NL.1.For determination of internal clearances, extreme wind loads shall be considered, taking into account Del respectively Dpp. according to Table 5.8/NL.1. The conductor sag for the determination of external and internal clearance for extreme wind loads shall be considered at an ambient temperature of 10 °C.BS EN 50341-2-15 pdf download.